Cache JNI call results in SysUtils on native side.

base/android/sys_utils.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/android/sys_utils.h"
 
 #include "base/android/build_info.h"
 #include "base/sys_info.h"
 #include "jni/SysUtils_jni.h"
 
 namespace base {
 namespace android {
 
 bool SysUtils::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-bool SysUtils::IsLowEndDevice() {
+bool SysUtils::IsLowEndDeviceFromJni() {
   JNIEnv* env = AttachCurrentThread();
   return Java_SysUtils_isLowEndDevice(env);
 }
 
-size_t SysUtils::AmountOfPhysicalMemoryKB() {
+bool SysUtils::IsLowEndDevice() {
+  static bool is_low_end = IsLowEndDeviceFromJni();
+  return is_low_end;
+}
+
+size_t SysUtils::AmountOfPhysicalMemoryKBFromJni() {
   JNIEnv* env = AttachCurrentThread();
   return static_cast<size_t>(Java_SysUtils_amountOfPhysicalMemoryKB(env));
 }
 
+size_t SysUtils::AmountOfPhysicalMemoryKB() {
+  static size_t amount_of_ram = AmountOfPhysicalMemoryKBFromJni();
+  return amount_of_ram;
+}
+
 SysUtils::SysUtils() { }
 
 }  // namespace android
 }  // namespace base